True-false questions are worth 2 points each, three-choice multiple choice questions are worth 3 points each, five-choice multiple choice questions are worth 6 points each. The maximum possible score is 102. The exam period was 90 minutes; the mean score was 74.7; the median score was 77. Click here to see page1 page2 of the formula sheet that came with the exam.

Fred, whose mass is 60 kg, is riding on an elevator. He feels as if he weighs 612 N. How fast is the elevator accelerating?

(a) 0.18 m/s^{2} (b) 0.26 m/s^{2} (c) 0.4 m/s^{2}

(a) upward. (b) downward. (c) not enough information

Sally drops a bowling ball from a rooftop of height 65 m. How long does it take the ball to reach the ground? (Neglect air resistance.)

(a) 3.64 s (b) 4.12 s (c) 5.86 s (d) 6.77 s (e) 7.87 s

(a) 18.2 m/s (b) 21.3 m/s (c) 28.6 m/s (d) 35.7 m/s (e) 41.2 m/s

Harvey is riding on a raft that floats in a river. The river and raft move together southward at a speed of 3 mph. Harvey walks due west, with respect to the raft, at a speed of 2 mph.

Harvey's net speed with respect to the ground is

(a) 2.8 mph (b) 3.2 mph (c) 3.6 mph (d) 4.5 mph (e) 5.1 mph

(a) 5 mph (b) 1 mph (c) 0 mph

A baseball player throws a ball at an initial speed of 12 m/s at an angle of 30° above the horizontal (neglect air resistance, and assume the ball starts at the same height as the ground).

How long does the ball stay in the air?

(a) 0.228 s (b) 0.626 s (c) 0.801 s (d) 1.22 s (e) 1.76 s

(a) 5.46 m (b) 5.58 m (c) 10.49 m (d) 12.81 m (e) 12.73 m

(a) unchanged. (b) twice as large. (c) four times as large.

A box slides down a frictionless, inclined plane that makes an angle with the horizontal. Let the symbol F denote the component of the force parallel to the ramp, m the mass of the box, and N the normal force.

Which one of the following statements is true?

(a) F = mg cos(θ) and N = mg sin(θ) (b) F = mg tan(θ) and N = mg sin(θ) (c) F = mg sin(θ) and N = mg cos(θ) (d) F = mg sin(θ) and N = mg (e) F = mg and N = mg sin(θ)

(a) mg cos(θ) (b) mg sin(θ) (c) mg

(a) doubles. (b) halves. (c) remains the same.

You are traveling in an airplane at 500 miles/hour due east. There is a strong crosswind blowing from north to south, at 200 miles/hour. The airplane has mass 10^{4} kg.

What is the total distance traveled by the airplane in 1 hour?

(a) 500 miles (b) 539 miles (c) 700 miles

(a) The airplane stays at the same altitude. (b) The airplane drops 9.8 m. (c) The airplane drops 19.6 m.

(a) She accelerates upward compared to the airplane and hits the ceiling. (b) She feels weightless while the airplane is dropping. (c) She feels a force pushing her towards the floor.

A skier is initially at rest on a ski slope as shown. The coefficient of static friction between the skis and the slope is 0.1. The coefficient of kinetic friction is 0.05.

What is the smallest angle θ such that the skier will start to move without pushing off?

(a) 5.71° (b) 7.10° (c) 8.49° (d) 9.83° (e) 11.21°

(a) 0.25 m/s^{2} (b) 0.49 m/s^{2} (c) 0.98 m/s^{2}

An acrobat is hanging off of two ropes, one vertical and one at an angle θ of 45°. The acrobat's mass is 70 kg.

What is the tension in the angled rope?

(a) 0 N (b) 485 N (c) 686 N

(a) 0 (b) 485 N (c) 686 N

(a) 500 kg (b) 1000 kg (c) 10000 kg (d) 11000 kg (e) 20000 kg

(a) It is impossible for both of us to reach the shore. (b) I can reach the shore before my friend. (c) It is possible for only one of us to reach the shore with the other remaining on the ice. (d) Either both of us or none of us can reach the shore. (e) None of the above.

A cannonball is shot at an upward angle of 45° from horizontal. As it exits the cannon, the ball has speed of 100 m/s. The mass of the cannon ball is 10 kg. You may assume that the muzzle exit of the cannon is at the same height as the target.

The cannon ball hits the target exactly. How far is the target from the cannon?

(a) 510 m (b) 1020 m (c) 1883 m

(a) 15.6 m (b) 31.2 m (c) 62.4 m

(a) v_{x} = 0 m/s, v_{y} = 0 m/s (b) v_{x} = 30000 m/s, v_{y} = 0 m/s (c) v_{x} = 30000 m/s, v_{y} = 30000 m/s

(a) 0 m/s^{2} (b) sin(θ) g (c) cos(θ) g